# [prefix_]getEntryId

Use this function to return ID for the entry. This ID is used as the reference for the document. Either this function or `getEntryIdXPath` must result in a valid reference.

Inputs: | xml (XmlDocument), document (Document)
Outputs: | id (string)
See also: | [prefix_]getEntryIdXPath

## Example

    function myPrefix_getEntryId(xml, document)
       return "reference"
    end

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